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Dynamics of network formation in aqueous suspension RAFT styrene/divinylbenzene copolymerization
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Orientador(es)
Resumo(s)
Experimental studies concerning the RAFT copolymerization of styrene and
commercial divinylbenzene were performed in order to assess the use of controlled
radical polymerization for the production of non-conventional polymer networks.
Aqueous suspension polymerizations were carried out in stirred batch reactor and
changes of a few operation parameters were tried in order to assess their effect on key
product properties: reaction temperature, initial ratio monomer/RAFT agent, monomer
dilution in the organic phase and crosslinker content in the monomer mixture were
changed along the experimental program. Polymerizations were extended beyond the
gel point in order to synthesize gel beads. The effect of different commercially available
RAFT agents (e.g. S-thiobenzoyl thioglycolic acid and two trithiocarbonates) on network
process formation was also studied. Dynamics of gel formation was measured using
size exclusion chromatography with refractive index and light scattering detection.
Iodine chloride titration yielded pendant double bonds concentration. In-line and offline
FTIR-ATR measurements were also performed in order to obtain information
concerning the kinetics of formation and final structure of the gels.
Descrição
Palavras-chave
Crosslinking FTIR-ATR Networks RAFT
Contexto Educativo
Citação
Gonçalves, Miguel; Pinto, Virgínia; Dias, Rolando; Hernándes-Ortiz, Julio; Costa, Mário Rui (2013). Dynamics of network formation in aqueous suspension RAFT styrene/divinylbenzene copolymerization. In Hans-Ulrich Moritz, Werner Pauer (eds.) Polymer Reaction Engineering – 11th International Workshop e Macromolecular Symposia. ISSN 1521-3900. 333:1, p. 273-385
Editora
WILEY-VCH